Republican Warren G. Harding won 60.32 percent of the popular vote in the 1920 Presidential election, with a margin of victory over Democrat James M. Cox of 26.17 percent. Harding swept the Northeast, Midwest and West, losing only the Democratic Solid South.
Republicans were the normal U.S. majority party from 1900 through 1928. They won six of eight U.S. Presidential elections.
Incumbent Democratic President Franklin D. Roosevelt won 60.8 percent of the popular vote in the 1936 Presidential election, with a margin of victory over Republican Alfred E. Landon of 24.26 percent. Roosevelt swept the country except for two New England states, giving rise to the quip, “As Maine goes, so goes Vermont.”
Roosevelt’s New Deal made the Democrats the majority party. They won six out of the eight Presidential elections from 1932 through 1964.
Incumbent Democratic President Lyndon Johnson won 61.05 percent of the popular vote in the 1964 Presidential election, with a margin of victory over Republican Barry Goldwater of 22.58 percent. Johnson carried every state that Harding carried except one, but lost five Deep South states that went Democratic in 1920.
The Democratic majority seemed shaky after Republican Dwight D. Eisenhower won the Presidency in 1952 and 1956, and Democrat John F. Kennedy won with less than a 1 percent margin in the popular vote in 1960. But Democrat Lyndon Johnson won a landslide when he convinced voters that his opponent threatened the New Deal gains.
Incumbent Republican President Richard M. Nixon won 60.67 percent of the popular vote in the 1972 Presidential election, with a margin of victory over Democrat George McGovern of 23.15 percent. Nixon swept the country except for Massachusetts and the District of Columbia.
Nixon restored the Republican Party to majority status in Presidential elections. Republicans won five out of the six Presidential elections from 1968 through 1988.
Incumbent Republican President Ronald Reagan won 58.77 percent of the popular vote in the 1984 Presidential election, with a margin of victory over Democrat Walter Mondale of 18.21 percent. Reagan swept the country except for Minnesota and the District of Coluumbia. in 1984.
Reagan’s victory appeared to consolidate the Republican Party as the majority party. Yet from 1992 on, political power see-sawed between Republicans and Democrats. In 1992, 1996 and 2000, neither the Democratic nor Republican candidate received 50 percent of the votes cast. Republican George W. Bush’s popular vote margin in 2004 was only 2.46 percentage points. Barack Obama’s margin in 2008 was a solid but less-than-landslide 7.27 percentage points.
My guess is that the margin in 2012 will be narrow. I think voters will continue to be dissatisfied with both parties until the leaders of one of them adequately address the nation’s economic problems.
Click on List of United States presidential elections by popular vote margin for the Wikipedia tabulation. The vote share of Democratic and Republican Presidential candidates doesn’t add up to 100 percent because they’re never the only candidates on every state’s ballot.
What these maps show is the stability of the American two-party system in the 20th century and the fact that even an overwhelming electoral college victory is never permanent.
Republicans appeared to have an overwhelming national majority in the 1920s. But this was wiped out by the inadequate response of President Hoover to cope with the Great Depression.
President Franklin Roosevelt, following his overwhelming victory in 1936, took this as a mandate to oppose conservative Democratic Senators in the 1938 primaries and to reorganize the Supreme Court to get decisions more to his liking. The result was the Republican-Southern Democratic alliance that put a stop to further New Deal legislation.
In 1964, the victory of President Lyndon Johnson over Senator Barry Goldwater was so overwhelming that many pundits feared for the future of the Republican Party. Four years later, after race riots in America’s major cities and President Johnson’s escalation of the Vietnam War, Richard Nixon made a comeback and pundits talked of a permanent Republican majority.
The 1972 election appeared to confirm the Republican majority status. But then came Watergate and the election of Jimmy Carter. Ronald Reagan’s victories in 1980 and 1984 seemed to show that Carter’s election was an aberration. But then Democrats went on to win four of the next seven elections (and the popular vote in one of the other three).
A lifetime of following politics has taught me that I can’t predict the future. But it is certainly possible that, given Donald Trump’s weakness as a campaigner, that Hillary Clinton will win a landslide victory.
But I don’t think this will assure Democrats of a permanent majority. Quite the contrary! Based on her past record, Clinton is highly likely to get the United States bogged down in more quagmire wars, as Lyndon Johnson did. The USA is due for another recession, and she is highly likely to be most concerned with shielding Wall Street from the consequences, as Herbert Hoover was. A landslide victory will not guarantee her reelection, any more than it did Richard Nixon’s.